US4453882A - Longreach linear pick-and-place assembly apparatus - Google Patents
Longreach linear pick-and-place assembly apparatus Download PDFInfo
- Publication number
- US4453882A US4453882A US06/372,319 US37231982A US4453882A US 4453882 A US4453882 A US 4453882A US 37231982 A US37231982 A US 37231982A US 4453882 A US4453882 A US 4453882A
- Authority
- US
- United States
- Prior art keywords
- pivot plate
- crank arm
- cam
- intermittent motion
- operable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
- B65G47/90—Devices for picking-up and depositing articles or materials
- B65G47/902—Devices for picking-up and depositing articles or materials provided with drive systems incorporating rotary and rectilinear movements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/18—Mechanical movements
- Y10T74/18056—Rotary to or from reciprocating or oscillating
- Y10T74/1828—Cam, lever, and slide
Definitions
- This invention relates to cam driven assembly devices, and more specifically to a linear pick-and-place assembly apparatus having an elongated reach.
- Automated assembly mechanisms are becoming more commonplace as production speeds are increased and manufacturing economics require that production facilities become automated.
- One such automated assembly mechanism is the cam-driven, pick-and-place assembly device.
- Such devices typically utilize linearly slidable guide rods which are activated by an oscillating output arm of a cam-driven index mechanism.
- Such devices are capable of picking up workpieces from a supply source and depositing them at a work station, for example.
- Examples of such linear pick-and-place assembly devices are typified by U.S. Pat. Nos. 3,865,253, 3,881,362, and 4,289,040.
- the slider mechanisms for the slide rods of such prior art devices were directly mounted to the associated indexer mechanisms. In any event, many of such prior art assembly devices were not satisfactory in that they were incapable of pivotally placing a workpiece, i.e., they had no vertical stroke component, only a linear horizontal stroke.
- An additional form of prior art device comprised a so-called trip-action air cylinder.
- the air cylinder's ram had a pivotal gripper mechanism which, upon extension of the ram to a desired point, was activated by a stop pin mechanism. This tripping would downwardly rotate the pivotal gripper mechanism which was mounted on the end of the ram thereby depositing a workpiece at the desired location. See for example, U.S. Pat. No. 4,200,180.
- Such prior art air cylinder devices were disadvantageous in that they had inherent speed problems, i.e., they had limited output speeds as they tended to vibrate workpieces off the pivotal gripper at high speeds.
- pivotal gripper devices had relatively short arm members compared to the overall length of the air cylinder's ram, the workpiece's vertical arc of travel when being deposited in the work station was quite large.
- the design of the workpiece and/or the work station for use with such pivotal gripper members had to accommodate large chordal actions.
- the present invention comprises a linear pick-and-place assembly apparatus which provides a relatively long reach for the gripper mechanism carried thereby but which uses a simple, relatively small drive mechanism. Additionally, due to the minimal chordal action which occurs during the placement of a workpiece by the present invention, an expanded range of assembly operations is permitted.
- an intermittent motion drive mechanism In the preferred embodiment this is a so-called two-stop, 180° indexer, i.e., a parallel plate cam type of index mechanism which provides a two-stop output. With such an indexer the oscillated output crank arm mounted is unidirectionally rotated but has intermittent stops at opposed locations. Multiple stops, of course, are possible depending upon the index cam's design.
- a pivot plate assembly is rotatably journalled to the housing of the index drive mechanism and operable to freely pivot about the indexer's output shaft.
- a linkage slide assembly is carried by the rotatable pivot plate and comprises elongated guide rods slidably mounted within ball slide devices.
- the slide rods are operable to move a gripper support mechanism attached thereto from a retracted or workpiece "pick-up" position to an extended or “place” position.
- the oscillated output crank arm of the index drive mechanism is pivotally connected to the slide rods to produce the two position linear output.
- a cam drive mechanism powered by the index drive's input drives cam followers carried by the rotatable pivot plate in a timed fashion. Those followers in turn drivably oscillate the rotatable pivot plate. This rotary oscillation in turn oscillates the slide rods and the gripper mechanism carried thereby in a plane normal to the axis of the indexer's output shaft. In effect, the slide rods and gripper mechanism can undergo both linear and rotary movements, whether performed simultaneously or consecutively.
- FIG. 1 is an elevation view of the linear longreach pick-and-lace assembly apparatus of the present invention depicting a floor stand mounting and showing various components in alternate positions;
- FIG. 2 is a plan view of the assembly apparatus of FIG. 1;
- FIG. 3 depicts three alternate motion charts which illustrate the movement of the gripper mechanism for different assembly operations.
- FIG. 1 an illustration of the longreach linear pick-and-place assembly apparatus of the present invention, generally denoted by reference numeral 20, mounted on a floor stand 22.
- a housing 24 for an index drive mechanism, the latter unit generally denoted by reference numeral 26, is bolted to the floor stand 22.
- the combination of a motor 28 and a worm gear speed reducer 30 provides a constant speed unidirectional input rotation to the input shaft 32.
- the speed reducer 30 is supported by a gear housing 34 which in turn is mounted to the side of the index drive housing 24.
- the index drive mechanism 26 can be of any of the well known types of cam-driven devices which produce an indexed or oscillated output.
- the indexer 26 is a parallel plate cam type of index drive assembly as is typified by U.S. Pat. No. 3,525,268.
- a parallel plate cam indexer mechanism utilizes an input shaft (shaft 32 of the present invention), a pair of parallel plate cams and a follower wheel mechanism (neither shown) which are both housed within indexer housing 24, and an output shaft (indexed output shaft 36 of the present invention) which is connected to the indexer's follower wheel mechanism.
- a collar 38 is rigidly affixed to oscillated output shaft 36 by a key 40 and carries an output crank arm 42.
- any number of various stops or dwell positions for the oscillated crank arm 42 can be achieved by merely revising, in a well known fashion, the design of the parallel plate cams (not shown, but see U.S. Pat. No. 3,525,268) in index drive 26, or alternatively, the cam design of any other type indexer oscillator, or similar type mechanism which is selected for use as the intermittent motion drive device in the present invention. It also will be understood that the intermittent motion drive device's rotation need not be unidirectional for purposes of the present invention, i.e., the output could be oscillated back and forth rather than indexed in the same direction.
- the so-called two-stop index drive mechanism 26 continuously oscillates the crank arm 42 in a counterclockwise direction between a left or retracted position (shown in phantom in FIG. 1) and a right or extended position (shown in solid in FIG. 1).
- a pivot plate assembly generally denoted by reference numeral 44, comprises a pivot plate 46 having a generally trapezoidal configuration (FIG. 1).
- a so-called four-point contact bearing 48 is utilized to rotatably mount the pivot plate 46 to the housing 24 of index drive 26.
- the four-point contact bearing generally denoted by reference numeral 48 (FIG. 2), comprises a seal 50 which is first retained against an annular step in the rotatable pivot plate 46 by an outer ball bearing raceway 52. Raceway 52 is secured to plate 46 by threaded fasteners 54 and rotates therewith.
- the seal 50 is also retained against an inner annular support or stationary collar 56 formed as part of housing 24 by use of threaded fasteners 58 and a bearing retainer plate 60.
- pivot plate 46 is permitted to freely rotate relative to the index drive housing 24 about the axis of output shaft 36 in a plane normal thereto. This rotation is best illustrated in FIG. 1 where the pivot plate 46 is shown in solid lines in a generally horizontal position. Plate 46 is also shown in phantom lines in a position where it has been slightly rotated in the clockwise direction about input shaft 36. It further will be understood that this rotation or rotary stroke of the pivot plate 46 of assembly apparatus 20 can be provided regardless of the stage of linear stroke of the elongated slide rods thereof. This is accomplished through use of a proper cam design, all as will be explained in more detail later herein.
- FIGS. 1 and 2 there is illustrated a slide linkage assembly, which is generally denoted by reference numeral 61.
- Assembly 61 comprises a pair of elongated ball slide rods 62a, 62b which are respectively carried, i.e., linearly and slidably supported, by separate pairs of Ball Bushings (trademark) 64a, 64b. Such bushings in turn are respectively mounted to the pivot plate 46 by fasteners 66.
- a gripper support mechanism generally denoted by reference numeral 68, is carried at the ends of slide rods 62a, 62b.
- a pair of clamp channels 70 can be used to fasten any of the various well known types of gripper hand mechanisms (not shown) to the gripper support mechanism 68.
- channels 70 could be replaced with threaded holes for fasteners.
- a connector link 72 is pivotally connected at its right end (FIG. 2) by a pivot pin 74 to gripper support 68 and at its left end by a pivot pin 76 to the oscillating crank arm 42 of index drive 26.
- the slide rods 62a, 62b are slidably and linearly reciprocated through the respective pairs of ball bushings 64a, 64b along the direction of the double-headed arrow shown in FIG. 1.
- the length of the crank arm 42 can be 13", for example, thereby giving a linear stroke of 26" between pickup and place positions for a workpiece.
- the end-to-end length of the slide rods 62a, 62b could be 48", for example.
- the ratio of the length of the connector link 72 to the crank arm 42 be at least a 3:1 ratio. This is necessary so as to effectively transfer the harmonic motion of the parallel plate drive cams (not shown) within the index drive mechanism 26 to the slide rods with a minimum distortion.
- a cam drive assembly is utilized to drivably oscillate the pivot plate 46 about the axis of output shaft 36.
- the cam drive assembly 78 comprises a pinion gear 80 which is secured to input shaft 32 and meshed against a driven gear 82; both of said gears are housed within gear housing 34. It will be noted that the ratio of diameters of gear 82 to gear 80 is approximately 2:1, the reason for which will be explained later herein.
- a jackshaft 84 mounted to the driven gear 82 is retained by pillow blocks 86 against the side of the indexer housing 24.
- a groove or so-called captured track cam 88 is affixed to jackshaft 84 at the end opposite driven gear 82 and carries an upstanding cam rib 90 (FIGS. 1 and 2).
- a pair of roller cam followers 92 are rigidly fastened to the left end (FIG. 2) of pivot plate 46 and extend downwardly therefrom towards the side of track cam 88 such that the cam rib 90 is captured and retained between the roller followers 92.
- cam rib 90 and the distance between the respective axes of the cam followers 92 are preferably designed such that the followers 92 are pre-loaded against the cam rib 90. This pre-loading is useful to prevent any so-called end play or backlash of the gripper mechanism and workpiece, i.e., the gripper and workpiece are relatively vibration-free during all segments of a given cycle of operation.
- pivot plate 46 is able to freely rotate about the axis of output shaft 36 due to the pivotal connection of pivot plate 46 and index drive housing 24 produced by the four-point contact bearing 48.
- the controlled oscillation or rotary rocking of pivot plate 46 thus, is provided by the cam drive assembly 78.
- clockwise rotation of input shaft 32 causes pinion gear 80 to rotate drive gear 82, jackshaft 84, and track cam 88 in a counterclockwise direction.
- the resulting rotation of cam rib 90 effects displacement of the cam followers 92 which in turn drivably oscillates pivot plate 46 about output shaft 36 between its solid line and its phantom line positons (FIG. 1).
- Such rotary oscillation of pivot plate 46 and ball bushings 64a, 64b thereby causes the slide rods 62a, 62b and gripper support 68 to be oscillated in a generally vertical direction, i.e., to undergo a rotary rocking motion between their perspective solid line and phantom line positions (FIG. 1).
- the ratio of driven gear 82 to pinion gear 80 can be adjusted to establish the number of rotary oscillations of plate 46 for every complete cycle of linear travel of gripper support 68.
- the 2:1 ratio of gear 82 to gear 80 can be used to produce two oscillations (one downward and one upward) of plate 46 for each complete cycle of slide rods 62a, 62b, for example.
- FIG. 3-A A few of the several output motions which can be produced by the present invention are shown in the motion charts of FIG. 3, wherein position "X" represents the workpiece pick-up position and position "Y” represents the placing position.
- the workpiece is carried by gripper support 68 and transferred horizontally from position X to a full extension position (for slide rods 62a, 62b) whereat the track cam 88 has caused oscillation of pivot plate 46 which in turn produces the chordal action for gripper 68, i.e., vertical rotary oscillation, which is depicted in the right section of FIG. 3A. That chordal action continues until the workpiece is deposited at the placing position Y.
- a further cycling of the longreach linear pick-and-place assembly apparatus of the present invention returns the empty gripper support mechanism 68 through a generally vertical arcuate path whereafter it is horizontally transferred to its full retracted position ready to again pick up a workpiece (not shown) at position X.
- the workpiece movement chart depicted in FIG. 3-A might represent, for example, an assembly operation wherein a workpiece is manually placed in the gripper mechanism at position X and then automatically deposited in a work station at position Y.
- FIG. 3-B the workpiece is picked up at position X, linearly transferred to the right of the full extension position (of slide rods 62a, 62b), passed downwardly through a generally vertical chordal movement, and deposited at the placing position Y.
- a further operation of apparatus 20 causes the generally horizontal linear retraction (of slide rods 62a, 62b) until such time point as the pivot plate 46 is rotatably oscillated in a generally vertical direction whereupon the gripper support 68 is returned to the pick-up position X.
- the motion chart shown in FIG. 3-B could be for an apparatus 20 used in a fully automated assembly operation.
- the gripper 68 automatically picks up a part at position X, then transfers and deposits it at position Y, and then returns to position X to begin the next cycle.
- the vertical distance "Z" (FIG. 3-B) or downward placing stroke is approximately 3.25" while the vertical distance "W” or upward pick-up stroke is approximately 1.5".
- FIG. 3-C illustrates a side elevation of an assembly operation wherein the pick-up station X comprises a pair (only one shown) of workpiece support rungs 94 mounted to a wall 98 and which are separated by a sufficient distance to enable the gripper support 68 to be raised between such support rungs 94.
- the placing station Y also comprises a second pair (only one shown) of separated workpiece support rungs 98 mounted to wall 96.
- the gripper mechanism 68 of assembly apparatus 20 is, in effect, moved through a FIG. 8 pattern.
- the workpiece is first picked up at position X, then the slide bars 62a, 62b and pivot plate 46 of apparatus 20 are so simultaneously reciprocated as to move the gripper support 68 and workpiece (not shown) upwardly to the next higher placing position, as is illustrated in FIG. 3-C, whereafter the gripper support 68 is returned to pick up another workpiece at the lower position X.
- any of the motions depicted in FIGS. 3-A through 3-C can be achieved with the longreach linear pick-and-place assembly apparatus of the present invention. Additionally, as is noted above, by well known modifications in the design of the various cam and gear components used in the present invention, any number of different pick-up and placing motions for gripper mechanism 68 can be achieved as are within the scope of such linear assembly devices.
- apparatus 20 of the present invention uses an intermediate rotatably-mounted pivot plate 46 to support the ball bushings 64a, 64b and slide rods 62a, 62b.
- a minimal chordal action is developed in placing a workpiece as the entire length of the elongated slide rods 62a, 62b and connector link 72 are used to transfer the rotary oscillation provided by pivot plate 46.
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Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/372,319 US4453882A (en) | 1982-04-27 | 1982-04-27 | Longreach linear pick-and-place assembly apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/372,319 US4453882A (en) | 1982-04-27 | 1982-04-27 | Longreach linear pick-and-place assembly apparatus |
Publications (1)
Publication Number | Publication Date |
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US4453882A true US4453882A (en) | 1984-06-12 |
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ID=23467656
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Application Number | Title | Priority Date | Filing Date |
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US06/372,319 Expired - Lifetime US4453882A (en) | 1982-04-27 | 1982-04-27 | Longreach linear pick-and-place assembly apparatus |
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US (1) | US4453882A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0523481A1 (en) * | 1991-07-19 | 1993-01-20 | LANGENSTEIN & SCHEMANN GMBH | Device for unloading blocks from a moulding press |
US5345831A (en) * | 1993-06-22 | 1994-09-13 | Emerson Electric Co. | Drive for linear pick-and-place assembly apparatus |
US6098478A (en) * | 1998-11-06 | 2000-08-08 | Emerson Electric Co. | Linear pick and place drive with adjustable stroke ranges |
US20020169962A1 (en) * | 2001-05-10 | 2002-11-14 | Brundage Trent J. | Digital watermarks used in automation equipment |
US20040032972A1 (en) * | 2001-05-10 | 2004-02-19 | John Stach | Digital watermarks for unmanned vehicle navigation |
US6776846B2 (en) * | 1986-04-18 | 2004-08-17 | Applied Materials, Inc. | Integrated processing system having multiple reactors connected to a central chamber |
US20220315356A1 (en) * | 2019-05-27 | 2022-10-06 | Mespack, Sl | Conveyor device for conveying flexible containers along a packaging line |
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-
1982
- 1982-04-27 US US06/372,319 patent/US4453882A/en not_active Expired - Lifetime
Patent Citations (14)
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US3178040A (en) * | 1965-04-13 | Work handling apparatus | ||
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6776846B2 (en) * | 1986-04-18 | 2004-08-17 | Applied Materials, Inc. | Integrated processing system having multiple reactors connected to a central chamber |
EP0523481A1 (en) * | 1991-07-19 | 1993-01-20 | LANGENSTEIN & SCHEMANN GMBH | Device for unloading blocks from a moulding press |
US5345831A (en) * | 1993-06-22 | 1994-09-13 | Emerson Electric Co. | Drive for linear pick-and-place assembly apparatus |
US6098478A (en) * | 1998-11-06 | 2000-08-08 | Emerson Electric Co. | Linear pick and place drive with adjustable stroke ranges |
US20020169962A1 (en) * | 2001-05-10 | 2002-11-14 | Brundage Trent J. | Digital watermarks used in automation equipment |
US20040032972A1 (en) * | 2001-05-10 | 2004-02-19 | John Stach | Digital watermarks for unmanned vehicle navigation |
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US20220315356A1 (en) * | 2019-05-27 | 2022-10-06 | Mespack, Sl | Conveyor device for conveying flexible containers along a packaging line |
US11787645B2 (en) * | 2019-05-27 | 2023-10-17 | Mespack, Sl | Conveyor device for conveying flexible containers along a packaging line |
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